摘要
根据B-R准则,结合结构时程响应曲线,判定弦支穹顶结构的动力稳定性,以跨度为120m的K8型弦支穹顶结构为研究对象,考虑不同矢跨比、不同预应力大小和不同地震波输入等参数的影响,对比分析其在水平、竖向和三向地震作用下极限承载力的不同及其变化规律。分析结果表明:大跨度弦支穹顶结构为了控制结构位移的需要,需施加较大的预应力,拉索引入较大预应力会增大与其相连的上部环向杆件的应力,使环向杆件在三维地震作用下更容易进入塑性;随着矢跨比增大,结构临界荷载增大但幅度很小。
Based on B-R criteria combined the method and time history response curves, the dynamic stability of suspend domes was judged. The dynamic stabilities of suspend dome of 120m span under vertical, horizontal and three-dimensional seismic excitation were calculated respectively taken into account the different pre-stress values and the different rise-span ratios. The results show that the large span suspend dome structure needs to exert greater pre-stress to control displacement and the introduction of high intensity cables increase the stress of circumferential bars which make circumferential bars more easily reach plasticity, and the critical dynamic load of the structure increases with the increase of the ratio of rise to span while the increasing magnitude is small.
出处
《井冈山大学学报（自然科学版）》
2014年第1期76-83,共8页
Journal of Jinggangshan University (Natural Science)
基金
江西省自然科学基金项目(20132BAB202006)
江西省教育厅科学技术研究重点项目(GJJ10025)
关键词
大跨度
弦支穹顶
动力稳定
地震作用
矢跨比
large span
suspend dome
dynamic stability
seismic excitation
ratio of rise to span
